Toolholder



Sept. 12, 1944.- o. F. TRIPPLER TOOL HOLDER Filed Feb. 19, 1944 INVENTOR. 022w 7 Waf le z Patented Sept. 12, 1944 I TOOLHOLDER.

Otto F. Trippler, East Detroit, Mich. Application February 19-, 1944, Serial No. 523,063.

4 Claims.

' This invention relates to improvements in tool-.

holders for conventional tool bits. At the present time it is customary to provide holders from which such bits project in a substantially horizontal plane. These tools are frequently employed on lathes which are operated by unskilled or semiskilled help who feed the slide on which the holder is secured to a stop by which time a cut of the required depth has been taken. However each time after the bit has been removed and reground it must be so reset in the holder that it projects a predetermined distance otherwise the depth of the cut taken when the slide is again fed to its stop is incorrect. It is an object of this invention to provide a toolholder wherein the bit is supported substantially vertically so that slight variation in the distance which the bit projects makes no material difference to the depth of the cut taken under the conditions above mentioned, that is when feeding to a stop. Again even a relatively I unobservant operator can readily see if the top of the bit is in substantial alignment with the axis in many types of older lathes only few adjust- 1 ments are provided and it is therefore necessary to maintain the cutting edge of the bit at substantially the height at which a horizontal bit would be held by a conventional type of holder.

A further object of the invention is to provide a toolholder including an axially movable tool bit engaging member for holding the bit immovable, and means for moving the said member into firm engagement with the tool bit. v

Another object of the invention is to provide such a toolholder with means for supporting the underside of a tool bit irrespective of the length of the latter and the distance which it projects from the holder, thereby supplementing the grip exerted upon the tool bit by the axially movable engaging member.

Having thus briefly and broadly stated some of the objects and advantages of the invention, I will now proceed to describe a preferred embodiment thereof with the aid of the accompanying drawing, in which:

Figure 1 illustrates a side view of the inveintion, and

Figure 2 is a plan view thereof.

Figure 3 is a section on the line 33 of Figure 2, and

Figure 4 is a section on the line 44 of Figure 3.

Referring to the drawing, l designates a toolholder having a shank 2 integral with which at its member H and the front extremity is a head 3 of increased depth,

and forming a portion of the head is a forward projection 4 which extends upwardly from adjacent the bottom of the said head to substantially the same level as the underside of the shank 2..

Formed substantially vertically through the projection 4 is a slot 5 through which a tool bit 6 is freely slidable. Extending rearwardly and horizontally through the projection 4 and the head 3 from the slot 5 to the back of the head is an aperture 1 the rear extremity of which is closed by a plug 8. Formed vertically downward in the head 3 from the top thereof and terminating in the aperture 1 immediately in front of the plug 8 is a threaded opening 9 having a set screw H) in engagement therewith. Axially slidable in the aperture 1 is a locking member H the front extremity of which is formed to engage a portion of the periphery of the tool bit 6 and its rear extremity is downwardly and rearwardly inclined and spaced in front of the plug 8. The locking plug 8 are both preferably hardened.

Resting partly against the plug 8- and partly against the inclined rear extremity of the locking member I I so that it is supported above the bottom of the aperture 1 is a ball l2. By downward movement of the set screw I0 pressure is exerted upon the ball l2 by which the locking member II is forced forward into engagement with the tool bit 6 so that the latter is held immovable between the said member and the opposite side of the slot 5. In order to prevent lateral movement of the ball I2 between the plu 8 and the engaging member I I a substantially vertical groove Ila may be formed in the inclined rear face of the said member to receive a portion of the ball periphery.

Extending downwardly from the underside of the projection 4 is a threaded stem l3 in engagement with which is a nut l4 upon the upper margin of which an annular seat [5 is provided to support the underside of the bit 6, so that after the latter has been set at the required height the nut !4 may be tightened against its underside to further support the bit. Removal of the latter is facilitated by upward rotation of the nut l4 after the set screw H has been loosened, as this movement of the bit causes sufficient rearward movement of the member H to permit the bit to travel freely in its slot.

The slot 5 is preferably forwardly and upwardly inclined at an inclination of about 7 to 10 degrees to the vertical to provide additional clearance between the tool bit 6 and the work A, and the stem 53 is mounted parallel with the axis of the slot 5. Moreover to facilitate attachment of the stem l3 to the projection 4 the underside of the latter is usually forwardly and downwardly 1. A toolholder including a shank having a.

head at one extremity, said head having a subin threaded engagement with said opening stantially vertical slot therethroug-h, a tool bit.

slidable through the slot, said head-having a horizontal aperture therein extending rearwardly from the slot and closed at its opposite extremity, a tool bit, engaging member axially movable in sa d aper ur ha ing. ts r a extremity nc ned a bal res ing n n id against t inclined extremityofthe member and on the other side against the closed end of the aperture, the headliaving a threaded opening" therein extending at right angles from the aperture and oppositesaid ball; anda screw in threaded engagement with the opening adaptedto exert pressureagainstsaid ball and thereby move the en gaging member-- toward said tool bit and hold o the'latterimmovable between said member'and the opposite; side of the slot.

2. A tool holder including the combination set forth in claim 1:, including a threaded stem projecting from the head' parallelwith the tool bit and adjacent thereto, and-a nut on said stem for adjustment against the underside of the tool. bit.

' 3. A tool holder including a shank having a head at one extremity, said head-,having a sub? stantially vertical slot therethrough, a tool bit slid able through the slot, said' head having a horizontal apertureitherein extending rearwardly 'fr omthe slot, a plug closing the opposite, end, of

the aperture, a tool bit engaging member; axially "movable in said, aperturev having. its rear. ex-

' underside of the tool bit.

of the-head, the top ofthe projection being ma-,

terially lower than the top of the shank, the projection having a substantially vertical slot therethrough, a tool bit slidable through the slot,

said projection and head having a horizontal aperture therethrough extending rearwardly from said slot, a plug closing the rear extremity of" the aperture, a tool bit engaging member axially movable in said aperture having its rear extremity downwardly and inwardly inclined, said member being spaced from saidplug, a ball resting against the inclined end of the member and against the inner extremity'of the plug, said head having a vertical threaded openingtherein terminating in the aperture opposite said ball, a screw in threaded engagement with the opening adapted to exert pressure upon said ball whereby the member-is forced into engagement with the tool bit and the latter is held immovable-between said member and the opposite side of the slot, a threaded stem extending down Ward from the projection, and anut'on said stem having an annular seat thereon to support the 'or'ro F; TRIPPlZlER. 

